Or alter the code of the script to feflect the different phpbb table names?

firebuff55123

You don't need to alter my code, it already takes care of any DB supported by phpBB itself. .
I believe you didn't get the concept of it, the script creates a new founder with which you can amend your original account. etc..

The Admin account IS a login account. Put that username in the login box and click the I forgot password link. You need to know the email address of the Admin account (the one you provided at installation).